[PATCH ARM]: Architectural Extensions (Matthew Gretton-Dann or Richard Earnshaw)

[Richard Earnshaw]

On 18/12/12 15:30, David Fernandez wrote:
> Hi Richard,
>
> Great, thanks for the info. That will keep me going. I'll look into
> .inst, as I was using just a .word to define it for now.
>
> Just as a comment to the whole thing, AFAIK both Cortex-Rn and
> Cortex-An have in essence the same architecture, i.e. same instruction
> set, same possible extensions, etc. The difference is that while
> extensions like virt and sec are standard in Cortex-An, they are
> optional in Cortex-Rn.
>
> So I would suggest, that both armv7-r and arm-v7a should have access
> to the same extensions, just that armv7-r will have most disabled by
> default, while armv7-a would have some enabled by default.
>
> Also, the banked registers instructions are not part of any extension,
> and should be present all time. It is a bit weird that you don't have
> them unless you enable the virt extension.
>

I'm not sure I understand what else you think is missing.

The file

	.arch armv7-r
	.thumb
	.syntax unified
	srsia	sp!, #4
	rfefd	sp!

assembles without error for me.

Perhaps you can provide a test-case.

R.